Means for attaching capillary tubes to bulbs



H. scHLAlcH v1,771,194

July 22, 1930.

MEANS FOR ATTACHING lCAPILLAFIY TUBES T0 BULBS Filed Aug. 10,v 1928 Mn/Y Patented July 22, 1930 l UNITED STATES' HERMAN SCHLAICH, F ELMHUBST,NEW YORK MEANS 'ron Aciiucirincf CAPILLARY TUBES 'ro BULBS Application.medvhugust 1li), 1928. Serial No. 298,772.

This invention relates to temperature responsive elements used'in heatactuated instruments of thedistance type, and more parv ticularly toimproved means for securing the capillary tubing to the temperatureresponi5 of such construction it is possible to solder,

the capillary tubing tothe plug and the plu to the shell, as well as tostiife'n the brai or other armouijof like nature surroundingthecapillary by the action of the solder, all

soin one operation. The resent invention, in

n addition to 1preserving t e advantages of thel invention o pose whichwill afford eater protection to 26 the ca illary tube itsel during thebrazing or sol ering operation than would be afforded b the armour alonearoundtthe tube. It Afurt er contemplates provision of means which willalso support both 'tlie capillary 80 tube and its surrounding sheath orarmour whereb a union'of a greater strength and durability is had, andin which danger of injury to the capillary at' such a union is reducedto a mimmum. Other objects to be attained and advantages of theinvention will: be more` fully apparent by reference to the followingdetailed description taken with the annexed drawing in which:

Figure 1 is a view partly in sectionof the parts in place, the samebeing an illustrative embodiment `of. the invention; v 'i Figure 2 isaview similar to Fig. 1, but showing the application of my improvedconnector to capillary tubing having an addip tional form of protectingarmour;

Figure 3 is a view in section of my improved connecting plug l,beforesoldering;

Figure 4 is a similarl view vof the form 5o shown in Fig. 2; and

said previous application, seeks toprovide an attaching means for thepur-.

Parini:NT yoi-liicla t y s 'Figure 5 is a view taken through therestricted portion of Fig. 3.

Referring to the drawings b characters of reference, denotes the Shel ofthe tem'- perature responsive element into which `fits j more or less tihtly the plug denoted generally by 11. l'Ibis plug has an'upper portion1 1" anda lower portion or plug proper. 11", which latter is providedwithra'central bore' 12 of slightlylargersize than the capillary whichit is to receive. Portion 11a has a bore 13 of lar er dimensions adaptedto receive the sheat of the capillary tubing. Intermediate said portions11* and 11", I referably provide slots 14, 14 tol rovide or a plicationofthe solder, Pre erably also t e lower portion of the plug is formedwith a shoulder 15 for the reception of solder, as will be apparentherey iter.

In use, the plug will e driven into the shell 10 vso that the plug proer 11" will project slightly below the toil)` o the shell als shown inigures 1 and 2. y hen the capillary tubing consisting of the ca illaryproper 16 and a sheath 17 which may e formed of braided metal wire, isintroduced in the lug as shown in lFigure 1, it being noted t at thevybore 13 is slightlylarger than the said sheath.

The brazing torch is then applied after which the proper quantity ofhigh melting point solder preferably hard or silver solder, is laced atthe top of the shell 10 whereu on, ue to the heat of the parts, suchsolder will fiow 'through the slots 14 covering the top ofthe plugportion proper 11" below the top of shell 10 and the groove 'or gutter'formed by the shoulder 15 and the shell 10. Due to the fact that thespace between the capillary and the bore 12 and that between the sheath17 and the bore 13 are of small dimensions, the solder will fill up suchspaces, as clearl It will be seen tb Furt ermore, some of the soldershown in Figures 1 and 2. c at in the one operation, the plug 11 issoldered to the shell10, the capwill penetrate through the braid andwill serve to stifen same. At the same time due to the fact vthat theiame of the 4brazing torch is separated from the capillary means of theupwardly extending portion 11, such capillary is adequately protected'from the heat of the ame.

In Figures 2 and 4 I have shown a modied form of the plug to be used incase the capillary has an additional `sheaf 19 of spiral form, such plugconsisting of a liared up er portion having an indenture 21 fittingetween the threads a of said sheath.

It will be noted that this construction has the additional advantagethat it affords anchorage for the outer sheath 19 without which the freeend thereof would have the tendency to ride up from the shell 10 andleave the capillary wholly or partially exposed, and due to vibration tochafe the parts at the union of the capillary with the shell. If desiredthe indenture 21 may be made after assembling and soldering whereby asomewhat tighter fitting of the parts may be had.

It will be understood that variations may be resorted to within thescope of the invention and that parts of the improvement may be usedwithout others.

What I claim is:

l. In a temperature operated device, in combination, a shell, a plughaving a portion lying completely in the mouth of the shell, a capillarytube inserted through the plug and solder sealing the plug to the shelland to the capillary tube, said plug having an upwardly extending sleeveportion surrounding said capillary tubing and adapted to protect samefrom the heat of the brazing operation.

'2. In a temperature operated device, in combination, a shell, a plughaving a portion lying completely in the mouth of the shell andextending downwardly therein for a substantial portion of the lengththereof, a capillary tube inserted through the plug and solder coveringthe top of the inserted porltion of the plug and sealing the plug to theshell and to the capillary tube, said plug having an .upwardly extendingsleeve portion surrounding said capillary tubing and protecting samefrom the heat of the brazing operation."

3. In a temperature operated device, in combinatioma shell, a plughavino' a portion lying completely in the mouth of the shell, acapillary tube inserted through the plug and'sealing the plug to theshell and to the capillary tube, said vplug having a portion ofdiminished diameter at the top thereof whereby to form with said shell arecess to contain solder.

4. Ina temperature operated device, in combination, a shell, .a plughaving a portion lying completely in'the mouth of the shell, a capillarytube inserted through the plug and solder sealing the plug to the shelland to the capillary tube, said plug having an upwardlyv extendingsleeve portion surrounding said capillary tubing and protecting samefrom the heat of the brazing operation, said plugy having a slot thereinintermediate the lengt thereof for the purpose of receiving the solderand permitting the same to flow longitudinally of the plug, to haveaccess to said capillary.

5. In a temperature operated device, 1n combination, a shell, a plughaving a portion lying completely in the mouth of the shell, a capillarytube inserted through the plug, said capillary being provided witharmour, solder sealing the plug to the shell and to the capillarytubing, said plug having an upwardly extending sleeve portion.surrounding said armour and tube, protecting the capillary from the heatof the brazing operation.

6. In a temperature operated device, in combination, a shell, a plughaving a portion lying completely in the mouth of the shell, a capillarytube inserted through the plug, said capillary being provided witharmour consisting of an inner layer and an outer layer, solder sealingthe plug to the shell and to the capillary tu ing, said plug having anupwardly extending sleeve portion surrounding said armorand havingmea-ns for engaging said outer layer.

7. A device according to claim 6 in which the outer layer vterminatesbefore the inner layer and in which the sleeve portion is attached tothe outer layer.

In testimony whereof I have aiiixed my signature to this specification.

HERMAN soHLAioH.

